Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Tractor Talk Discussion Forum

electric alternator wiring

Welcome Guest, Log in or Register
Author 
brio bean

11-12-2004 12:19:15




Report to Moderator

Does anyone know how to tell which wire is the field wire and which wire is the sensing wire on a 3 wire alternator? The next question is where should each of these wires be connected?




[Log in to Reply]   [No Email]
Allan in NE

11-12-2004 12:37:07




Report to Moderator
 Re: electric alternator wiring in reply to brio bean, 11-12-2004 12:19:15  
Bean,

Which alternator?

Allan



[Log in to Reply]  [No Email]
brio bean

11-12-2004 14:33:40




Report to Moderator
 Re: electric alternator wiring in reply to Allan in NE, 11-12-2004 12:37:07  
Allan, It's an Hitachi LT135-20 alternator that I'm assuming has its own regulator because the old voltage regulator on the tractor (from prior to its conversion to 12 volt) is totally disconnected. The tractor, an AC WD has been running fine, but we recently had starting problems, and when we undid the wiring harness we discovered that the two small wires from the alternator are not connected anyplace. Any help you can give would be appreciated. Thanks

[Log in to Reply]  [No Email]
Jon H

11-12-2004 16:26:30




Report to Moderator
 Re: electric alternator wiring in reply to brio bean, 11-12-2004 14:33:40  
I have no experience with Hitachi alternators,but a fellow who seemed to give reliable advice about alternators once posted this about expermenting with an unknown internal regulator alternator. "Apply 12V to the unknown leads using a test light or small range ammeter,the sense wire will not flow any measurable amperage,while the field/exciter wire will draw several amps". This sounds reasonable,as this is how it works on the 10-12 SI Delco alternator. The sense wire should be connected to the alternator output stud and the exciter wire should be connected to battery power only when the ignition switch is on. The Hitachi may or may not need a Diode or resistor to block return flow if the exciter wire is connected to the ignition terminal of the ignition switch as is necessary on a Delco internal regulator alternator.
Are there loose dangling wires from the alternator or are there just terminals with nothing connected? Maybe you should check if the alternator charges without these other wires connected on the chance it has some sort of one wire conversion like is done with the Delco alternators.

[Log in to Reply]  [No Email]
Frank Kovarick

11-13-2004 23:15:59




Report to Moderator
 Re: electric alternator wiring in reply to Jon H, 11-12-2004 16:26:30  
If it's like the Delco with internal regulator, there's only one wire to the ammeter to show charge etc. There is another connector that requires a small amp surge to get the field excited on start up. I just use a push button switch but have to remember to push this button to start the charging when the engine starts after a shut down. I tried to wire a small dash lamp into this circuit off the ignition switch to provide the necessary small amp jolt to excite the field but haven't gotten it to work so I revert to the push button switch. When I got the tractor, an 8N with the 12V conversion and the Delco alternator, the guy just had a short wire with the end insulation off and hot wired and he just brushed that other connection with this wire to energize the field. Not much finese.

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy